JP2007292025A - Fan motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fan motor with improved discharge efficiency of fluid. <P>SOLUTION: An outer shell member 1 comprises a casing 2 and a cover 3 covering an upper surface opening of the casing 2, and incorporates a fan 14 and a motor 21 rotating the fan 14. Flanged discs 25 are horizontally extended from an opening end as a lower end of a cup-like part 12, a plurality of fan blades 13 are radially stand on upper surfaces of the discs 25. Fin parts 30 are integrally formed on inner peripheral sides of a shaft 11 side of each fan blade 13. Air on disc 25 sides is positively taken by the fin parts 30 to increase a discharge amount of the air. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a fan motor including a fan that rotates about a shaft.

  Generally, this type of fan motor (for example, Patent Document 1) is widely used as a cooling fan for cooling various heat sources such as an MPU (microprocessor unit) in a personal computer or a liquid crystal panel mounted on a liquid crystal projector. Yes.

  FIG. 5 shows an example of such a fan motor. Reference numeral 1 denotes a flat fan motor outer member, which is a casing 2 made of a metal having good thermal conductivity, and an upper surface of the casing 2. And a cover 3 covering the opening. Reference numeral 4 denotes a bottomed cylindrical tube portion, that is, a bearing tube fixed upright to the casing 2 by caulking or insert molding, and a pair of upper and lower bearings 5 are press-fitted and fixed inside the bearing tube 4.

  A stator 7 having an iron core with windings mounted thereon and a circuit board 8 on which the stator 7 and other elements are mounted are fixedly attached to the outer periphery of the bearing tube 4. On the other hand, the rotor 10 rotated by the magnetic force from the stator 7 includes a shaft 11 as a rotating shaft that is rotatably supported in the bearing tube 4 by the bearing 5 and a plurality of blades on the outer peripheral side of the cup-shaped portion 12. That is, it is constituted by a resin-molded fan 14 having a fan blade 13 and a yoke 17 as a rotor case mounted on the inner peripheral surface of the cup-shaped portion 12 and facing the stator 7 and having a permanent magnet 16. The base end of the shaft 11 is fixedly attached to the center of the fan 14. The stator 7 and the rotor 10 constitute a motor 21 that rotates the fan 14.

  Here, the configuration of the fan 14 will be described in detail. From the opening end which is the lower end of the cup-shaped portion 12, a flange-shaped disk 25 extends in the horizontal direction while being lowered by one step in the middle, and is lowered by one step in this annular shape. A plurality of fan blades 13 are erected on the upper surface of the outer circumferential portion 25a radially about the shaft 11. The upper ends of the fan blades 13 are connected by a ring member 26.

By applying an electric current to the stator 7, an attractive force and a repulsive force are generated between the stator 7 and the permanent magnet 16 facing the stator 7, and the rotor 10 rotates around the shaft 11. Thereby, the air (air) warmed by the heat source is taken in from the intake hole 18 as the suction hole provided in the upper direction which is the axial direction of the shaft 11, and the exhaust gas provided in the direction perpendicular to the suction hole 18 is provided. Warm air is sent out from a hole (not shown) to prevent the temperature of the heat source from rising.
JP 2005-36676 A

  However, in the conventional fan motor, as shown by the arrow in FIG. 5 (the thickness of the arrow indicates the magnitude of the air flow), a large amount of air as the fluid sucked from the intake hole 18 is directed to the disk 25 side. Since the air flows and the air is pushed out almost uniformly by the fan blade 13 toward the outer periphery of the fan 14, the pressure on the disk 25 side is very high, and the uniform shape like the fan blade 13 has a drawback that the exhaust efficiency is insufficient. It was.

  In view of the above problems, an object of the present invention is to provide a fan motor with improved fluid discharge efficiency.

  In the fan motor according to the first and second aspects of the present invention, the amount of fluid discharged can be increased by aggressively scraping the fluid by the fin portion.

  In the fan motor according to the third aspect of the present invention, since the fluid flows along the smooth arc shape of the fan blade, the fluid can be discharged smoothly.

  In the fan motor according to the fourth aspect of the present invention, by adjusting the arc of the fin portion independently of the fan blade, for example, the fin portion has a curvature suitable for scraping of the fluid, while the fan blade has an outer periphery of the fluid. As a curvature suitable for extrusion in the direction, the exhaust performance and intake performance of the fan can be improved at the same time.

  In the fan motor according to the fifth aspect of the present invention, the flow of fluid from the fin portion to the fan blade is smooth, and the number of components can be reduced to facilitate the manufacture.

  According to the first and second aspects of the present invention, it is possible to provide a fan motor with improved fluid discharge efficiency.

  According to the third aspect of the present invention, the fluid can be pushed out smoothly to increase the fluid discharge efficiency.

  According to claim 4 of the present invention, higher air flow characteristics can be obtained.

  According to the fifth aspect of the present invention, it is possible to increase the fluid discharge efficiency and reduce the cost.

  Hereinafter, preferred embodiments of a fan motor according to the present invention will be described with reference to the accompanying drawings. In addition, the same code | symbol is attached | subjected to the same location as a prior art example, and since description of a common part overlaps, it abbreviate | omits as much as possible.

  FIG. 1 shows an example of a fan motor according to the present invention. An outer member 1 of the fan motor is composed of a casing 2 and a cover 3 that covers the upper surface opening of the casing 2. A bearing tube 4 is fixed upright in the casing 2 by caulking or insert molding, and a pair of upper and lower bearings 5 are press-fitted and fixed inside the bearing tube 4. A stator 7 having an iron core with windings mounted thereon and a circuit board 8 on which the stator 7 and other elements are mounted are fixedly attached to the outer periphery of the bearing tube 4. On the other hand, the rotor 10 rotated by the magnetic force from the stator 7 includes a shaft 11 as a rotating shaft that is rotatably supported in the bearing tube 4 by the bearing 5, and a plurality of fans on the outer peripheral side of the cup-shaped portion 12. A shaft formed by a resin-molded fan 14 having a blade 13 and a yoke 17 as a rotor case mounted on the inner peripheral surface of the cup-shaped portion 12 and facing the stator 7 and having a permanent magnet 16. The base ends of 11 are fixedly attached to the center of the fan 14. The stator 7 and the rotor 10 constitute a motor 21 that rotates the fan 14.

  Here, the configuration of the fan 14 will be described in detail with reference to FIG. A flange-shaped disc 25 extends horizontally from the opening end, which is the lower end of the cup-shaped portion 12, while being lowered in the middle, and on the upper surface of the outer circumferential portion 25a that is lowered in a ring shape, the shaft A plurality of fan blades 13 are erected in a radial pattern centering on 11. That is, the fan blades 13 are erected in an annular shape so as to surround the cup-shaped portion 12 with a certain distance therebetween. The upper ends of the fan blades 13 are connected by a ring member 26. In FIG. 2, the planar shape of the fan blade 13 viewed from above is a curved plate shape that forms a smooth arc, and the fin portion 30 is integrally formed on the inner peripheral side that is the shaft 11 side of the fan blade 13. ing. The fin portion 30 is formed by extending the fan blade 13 toward the inner peripheral side and is formed in a triangular plate shape that becomes wider as the outer peripheral portion 25a is approached. The arc has a different curvature. In FIG. 2, the curvature of the fin portion 30 is smaller than the curvature of the main body of the fan blade 13, and has a planar shape that forms an arc that is close to a straight line. Of course, the fin portion 30 can be provided independently of the fan blade 13 on the outer circumferential portion 25a as a separate member.

  The length (height) Y of the fin portion 30 is designed to be 1/3 or more of the axial length (height) L of the fan blade 13, and the extended width X of the fin portion 30 is The fan blade 13 including the fin portion 30 is designed to have a size that occupies 1/5 or more of the entire width W. When viewed from the outside of the fan 14, the fan blade 13 has a linear end surface shape except for the portion where the fin portion 30 is formed. Of course, it may have an end face shape with a different inclination, and when the upper end of the fan blade 13 on the side of the intake hole 18 is inclined in the direction of rotation of the fan 14, the air that has entered the disk 25 from the intake hole 18 On the other hand, the force scraped by the fan blade 13 acts strongly at the beginning, and it becomes possible to promote intake very effectively.

  Then, by applying an electric current to the stator 7, the rotor 10 rotates around the shaft 11. As a result, the air heated by the heat generation source is taken in from the intake hole 18 as an intake hole provided in the upper direction which is the axial direction of the shaft 11, and the exhaust hole provided in a direction orthogonal to the intake hole 18 (see FIG. The temperature of the heat source is prevented from rising by sending warm air from the outside to the outside.

  FIG. 3 shows the air flow in the fan motor shown in FIG. 1 with arrows. In the figure, the thickness of the arrow represents the magnitude of the air volume, and the air volume is larger on the disk 25 side where the fin portion 30 is provided in the fan blade 13 than on the intake hole 18 side. I understand. That is, the air sucked from the intake hole 18 is actively scraped by the fin portion 30 extended from the fan blade 13 to generate a high air volume on the disk 25 side. The air sucked from the suction hole 18 flows almost vertically in the fan 14 toward the disk 25. In the middle, due to the negative pressure generated by the fan blade 13, a part of the air flows in a horizontal direction, but most of the air flows with the negative pressure and inertia generated at the disk 25 side portion of the fan blade 13. As a result, the air flows in the vertical direction toward the disk 25 as it is.

  As a result, air gathers on the disk 25 side and the pressure increases, but the fan blade 13 is expanded near the outer circumferential part 25a of the disk 25 below, so that the fin part 30 is expanded, so the vicinity of the disk 25 The air gathered in the air can be actively scraped by the fin portion 30 and pushed out from the fan blade 13 toward the outer periphery. At this time, since air flows along the smooth arc shape of the fan blade 13, the air can be discharged smoothly. On the other hand, by providing the fin portion 30 on the fan blade 13, the air in the vicinity of the disk 25 is efficiently pushed toward the outer peripheral direction, so that the air flow sucked into the vicinity of the disk 25 and thus into the intake hole 18 is improved. The intake performance of the fan 14 is improved, and high airflow characteristics can be realized. In particular, the fan blade 13 of the present embodiment has an arc having a different curvature from the main body of the fan blade 13 and the fin portion 30, and by adjusting the arc of the fin portion 30 independently of the fan blade 13, for example, a fin While the part 30 has a curvature suitable for air scuffing, the fan blade 13 has a curvature suitable for extrusion of air in the outer circumferential direction, and simultaneously improves the exhaust performance and intake performance of the fan 14 to achieve higher airflow characteristics. Obtainable.

FIG. 4 is a graph showing the air volume versus static pressure characteristics of the fan motor according to the present invention and the conventional fan motor compared with each other at the same noise. It is a characteristic. From the figure, it can be seen that the fan motor in the present invention has an increased air volume (about 0.03 m ³ / min). It is to be noted that a shroud as a wind guide plate is provided opposite to the upper and lower sides of the fan blade 13, and the air around the fan motor can be efficiently guided to the fan blade 13 to improve the efficiency of the fan.

  As described above, in this embodiment, in the fan motor including the fan 14 having the fan blade 13 and the 21 motor for rotating the fan 14, the length of the fan blade 13 in the axial direction L is 1/3 or more. A fin portion 30 is formed by extending a portion corresponding to the length Y toward the inner peripheral side, and the fan blade 13 has a shape other than the portion where the fin portion 30 is formed, or an end face shape having a linear shape or a different inclination. Is configured.

  Further, in the fan motor of this embodiment, the fin portion 30 is formed with a dimension that the extension width X occupies 1/5 or more of the entire width W of the fan blade 13 including the fin portion 30. And

  In this way, the air discharge amount can be increased by positively scavenging the air as the fluid by the fin portion 30. Accordingly, it is possible to provide a fan motor with improved air discharge efficiency.

  Further, the fan motor of this embodiment is characterized in that the shape of the fan blade 13 is a smooth arc.

  In this way, since air flows along the smooth arc shape of the fan blade 13, the air can be discharged smoothly. Accordingly, the air can be pushed out smoothly to increase the air discharge efficiency.

  Further, the fan motor of this embodiment is configured such that the fan blade 13 body and the fin portion 30 have different arcs.

  In this way, by adjusting the arc of the fin portion 30 independently of the fan blade 13, for example, the fin portion 30 has a curvature suitable for air scraping, while the fan blade 13 moves toward the outer periphery of the air. As a curvature suitable for extrusion, the exhaust performance and intake performance of the fan 14 can be improved at the same time. Therefore, higher air volume characteristics can be obtained.

  Further, in the fan motor of this embodiment, the fan blade 13 and the fin portion 30 are integrally formed.

  In this way, the air flow from the fin portion 30 to the fan blade 13 becomes smooth, and the number of parts can be reduced to facilitate the manufacture. Therefore, it is possible to increase the air discharge efficiency and reduce the cost.

  In addition, this invention is not limited to the said Example, It can change in the range which does not deviate from the meaning of this invention. The shape of the fan blade is not particularly limited, and the structure of the fan motor is not particularly limited. In addition, the intake direction may be not only from one direction but also double-sided intake in the vertical direction, and the fan blade may protrude from the outer member.

It is a principal part longitudinal cross-sectional view of the fan motor in this invention. It is a top view which shows the structure details of a fan same as the above. It is a principal part longitudinal cross-sectional view which shows the flow of the air in a fan motor same as the above. It is a graph which shows air volume versus static pressure characteristics same as the above. It is a principal part longitudinal cross-sectional view of the fan motor in a prior art example.

Explanation of symbols

1 Outer member
11 Shaft
13 Fan blade
14 fans
21 Motor
30 Fin

Claims (5)

In a fan motor comprising a fan having a fan blade and a motor for rotating the fan, a portion corresponding to a length of 1/3 or more of the axial length of the fan blade is extended toward the inner peripheral side. A fan motor characterized in that the fan blade is formed so as to form an end face shape that is linear or has a different inclination except for the portion where the fin portion is formed. The fan motor according to claim 1, wherein the fin portion has an extension width that occupies 1/5 or more of the entire width of the fan blade including the fin portion. The fan motor according to claim 1 or 2, wherein the fan blade is configured to have a smooth arc shape. The fan motor according to claim 1 or 2, wherein the fan blade body and the fin portion are configured to have different arcs. The fan motor according to any one of claims 1 to 4, wherein the fan blade and the fin portion are integrally formed.

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